JPH0730471Y2 - Rear floor side member connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a coupling structure for a rear floor side member as a vehicle body constituting member that is disposed on a vehicle body floor side portion of a vehicle such as an automobile and extends in the vehicle body front-rear direction.

[Conventional technology]

The rear floor side member is used as a vehicle body constituent member that extends in the vehicle front-rear direction at the rear side of the center cross member, with the front end portion thereof being joined to the rear surface of the center cross member at the floor side portion of the vehicle body in an abutting state. Sho 63-2483
issue).

Depending on the joint structure, the rear floor side member can improve the rigidity of the entire vehicle body, reduce vibration and noise of the vehicle body, and improve steering stability.

For example, in the conventional rear floor side member coupling structure shown in FIG. 3, not only is the front end portion of the rear floor side member 10 abutted against the back surface of the center cross member 14 but also the vehicle body is better than the center cross member 14 in the vehicle body. Attach the rear floor side member 10 to the rear
The rear floor side member 10 is integrated with the locker by joining the locker inner member 12 in a superposed state along with the locker inner member 12 so that the rigidity of the entire vehicle body, particularly the bending, compression rigidity and torsional rigidity of the vehicle body can be improved. The direction of the arrow FR in the figure is the front of the vehicle body.

[Problems to be solved by the device]

However, in this bond structure,
It is not effective to use a divided structure in which 12 is divided into a locca inner front 16 and a locca inner rear 18 as shown in FIG. That is, in such a split structure of the rocker inner 12, the structure of the rocker inner rear 18 is closer to the front of the center cross member 14 than the rear portion of the center cross member 14, and is joined to the rocker inner front 16 in a superposed state so that the rear surface of the center cross member 14 is joined. The plate thickness of the rocker cross-section changes intermittently in the front-rear direction of the vehicle body in the vicinity of this portion, which is disadvantageous to bending, compression and twisting of the vehicle body.

In consideration of the above facts, the present invention has an object to obtain a rear floor side member coupling structure capable of improving vehicle body rigidity in a vehicle to which a split structure of the Locker Inner is applied.

[Means for Solving the Problems]

The present invention relates to a rear floor side member coupling structure that is coupled to a cross member at a vehicle body rear side of a coupling portion between a Lotka inner front and a Lotka inner rear, and is also coupled to a Lotka inner rear portion on a vehicle body rear side of the cross member in an overlapping state. A vertical wall extending at a front end of the rear floor side member along the rocker inner rear at least to a connecting portion of the rocker inner rear and the rocker inner front toward a front side of the vehicle body with a width gradually narrowed, and a front wall continuous with the vertical wall toward a front side of the vehicle body. It is characterized in that the cross member, the Locca inner rear and the extension are connected in an overlapping state by forming an extension having a lateral wall which narrows and extends.

[Action]

According to the present invention having the above-described structure, the rear floor side member is continuously joined to the locca inner from the coupling portion of the locca inner rear and the locca inner front to the rear of the locca inner rear, and the vertical wall of the extension portion overlapping the locca inner rear toward the front of the vehicle body. The width of the extension and the width of the lateral wall of the extension that overlaps the cross member are gradually narrowed, so there is no sudden change in rigidity at the part where the extension is lost, that is, at the front end of the extension. Can be reinforced. This makes the rocker advantageous against bending, compressive load and torsional load, and improves the joint rigidity between the rocker and the cross member.

〔Example〕

1 and 2 show the structure around a rear floor side member of a vehicle to which the present invention is applied, and the arrow FR direction in the drawings is the front of the vehicle body.

As shown in FIG. 1, the rear floor side member 20 extends below the rear floor pan 21 from near the center cross member 22 to the rear thereof along the rocker 24 in the vehicle front-rear direction. As shown in FIG. 2, the rear floor side member 20 has an extension portion 28 having a substantially L-shaped cross-section formed at the front end of a general portion 26 having a substantially hat-shaped cross-section shape. As a boundary, the general portion 26 extends on the rear side of the vehicle body, and the extension portion 28 extends on the front side of the vehicle body.

The general portion 26 is a bottom wall 30 and side walls rising from both sides of the bottom wall 30.
32, 34 and flanges 36, 38 bent at substantially right angles from the ends of the side walls 32, 34 are formed in a substantially hat-shaped cross section.
Further, a flange 39 is formed at the front end of the general portion 26 and is bent at a substantially right angle from the end portion of the side wall 34 inside the vehicle body. On the other hand, the extension portion 28 includes a vertical wall 40 extending from the side wall 32 outside the vehicle body of the general portion 26 toward the front side of the vehicle body with the width gradually narrowed, and the general portion 26.
And a lateral wall 42 extending from the bottom wall 30 toward the front side of the vehicle body with its width gradually narrowed to have a substantially L-shaped cross section.

The rear floor side member 20 is connected to the rear floor pan 21, the center cross member 22, and the locker 24, respectively, and contributes to improving the rigidity of the vehicle body.

More specifically, the flange 36 and the flange 38 of the general portion 26
Is welded to the lower surface of the rear floor pan 21 in an overlapping state, and the general portion 26 forms a closed cross section with the rear floor pan 21.

Further, the flange 39 of the general portion 26, the side wall 32 outside the vehicle body of the general portion 26, and the lateral wall 42 of the extension portion 28 are welded to the center cross member 22. The center cross member 22 is formed to have an L-shaped cross section by bending the horizontal wall 46 from the lower end of the vertical wall 44 toward the front side of the vehicle body toward the front side of the vehicle from the lower end of the horizontal wall 44 at a substantially right angle. The flange 39 of the general part 26 is welded to the back surface of the general part 26 in an overlapping state, and the extension part is formed on the lower surface of the lateral wall 46.
28 center cross members 22 are welded. A flange 47 is formed at the end of the center cross member 22 in the width direction of the vehicle body and is bent at a substantially right angle from the vertical wall 44 toward the front of the vehicle body. The side wall 32 of the general portion 26 is welded to the flange 47 in an overlapped state. Has been done. In the center cross member 22, the front end portion of the rear floor pan 21 is welded to the upper portion of the vertical wall 44 to form a closed cross section that extends in the vehicle width direction together with the front end portion of the rear floor pan 21. In addition, the horizontal wall 46 of the center cross member 22
A rear end of the front floor pan 45 is welded to the lower end of the front end of the front floor pan 45 in an overlapped state.

Further, the side wall 32 on the outer side of the vehicle body of the general portion 26 and the vertical wall of the extension portion 28
40 is welded to Lotka 24. The locker 24 is formed into a closed cross section by the locker inner 48 and the locker outer 50, and the side wall 32 of the general portion 26 and the vertical wall 40 of the extension portion 28 are welded to the locker inner 48 in an overlapping state. The Locca Inner 48 is a two-part structure and is composed of a Locca Inner front 52 on the front side of the vehicle body and a Locca Inner rear 54 on the rear side of the vehicle body. The vertical wall 40 of is extended. The Locca Inner front 52 and the Locca Inner rear 54 are welded in a partially overlapped state closer to the front of the vehicle than the vertical wall 44 of the center cross member 22. The side wall 32 of the portion 26 extends, and the vertical wall 40 of the extension portion 28 extends on the front side of the vehicle body. The tip of the vertical wall 40 of the extension portion 28 is located slightly ahead of the vehicle body with respect to the connecting portion between the Locca inner front 52 and the locca inner rear 54. In addition, a wheel house panel 56 is welded to the rear end of the Rotka Inner rear 54 in an overlapped state on the outside of the vehicle body.

According to the above-described configuration, the vertical wall 40 and the vertical wall 40 that extend to the front end of the rear floor side member 20 along the Locker Inner rear 54 to the joint between the Locker Inner rear 54 and the Locker Inner front 52 with the width gradually narrowed toward the front side of the vehicle body. And a lateral wall 42 continuously extending toward the front side of the vehicle body with its width gradually narrowed,
Since 28 is provided, the rear floor side member 20 is continuously overlapped with the Locca inner 48 from the joint of the Locca inner rear 54 and the locca inner front 52 to the rear thereof, and the locca inner rear is directed toward the front of the vehicle body.
Since the width of the vertical wall 40 of the extension portion 28 that overlaps with 54 and the width of the lateral wall 42 of the extension portion 28 that overlaps with the center cross member 22 are gradually narrowed, the portion where the extension portion 28 disappears, that is, the front end portion of the extension portion 28 has rigidity. The rear floor side member 20 can effectively reinforce the locker 24. This is advantageous for bending, compressive load and torsional load of the rocker 24, and the coupling rigidity between the rocker 24 and the center cross member 22 is improved.

That is, the extension 28 disperses the stress concentration at the intersection of the center cross member 22 and the locker 24 by the connection of the lateral wall 42 of the extension 28 to the center cross member 22 and the connection of the vertical wall 40 of the extension 28 to the locker 24. Acting as a gusset to improve the joint rigidity between the center cross member 22 and the locker 24.

As described above, in this embodiment, the rigidity of the rocker 24 can be improved and the coupling rigidity between the center cross member 22 and the rocker 24 can be improved. As a result, the bending rigidity, compression rigidity, and torsional rigidity of the vehicle body are improved, vibration noise of the vehicle body is reduced, and steering stability is improved.

[Effect of device]

As described above, the present invention has an excellent effect that the vehicle body rigidity can be improved in the vehicle to which the split structure locker inner is applied.

[Brief description of drawings]

FIG. 1 is a perspective view showing a structure around a rear floor side member of a vehicle to which the present invention is applied, FIG. 2 is an exploded perspective view of a main part of FIG. 1, and FIG. 3 is a structure around a conventional rear floor side member. It is a perspective view shown. 20 …… Rear floor side member, 22 …… Center cross member, 24 …… Locker, 28 …… Extended part, 40 …… Vertical wall, 42…
… Horizontal wall, 48 …… Rotka Inna, 52 …… Rotka Inna front, 54 …… Rotka Inner rear.

Claims (1)

[Scope of utility model registration request] 1. A connecting structure for a rear floor side member, which is connected to a cross member on a vehicle body rear side of a connecting portion between a Rotka inner front and a Rotuka inner rear, and is also connected to a Rokka inner rear portion on a vehicle body rear side of the cross member in an overlapping state. In the above, at the front end portion of the rear floor side member, a vertical wall extending gradually narrower toward the vehicle body front side along at least the coupling portion between the Rocker Inner rear and the Rocker Inner front, and a vertical wall continuous to the vertical wall to the vehicle body front side. A connecting structure for a rear floor side member, characterized in that an extension portion having a lateral wall that gradually narrows and extends is formed, and a cross member, a Rotka Inner rear and an extension portion are joined together in an overlapping state.